US Bridges

Commerce Blvd over Hinebaugh Creek

Fair

Sonoma County, California · 0.1 MI N Rnpk Expressway · Structure no. 20C0202

Built
1970
55 years old
Condition
Fair
inspected June 2023
Type
Culvert
Concrete Continuous
Length
48 ft
4 main spans
Daily traffic
500
2015 count
Owner
City
City or Municipal Highway Agency

About this bridge

Commerce Blvd over Hinebaugh Creek is a concrete continuous culvert carrying Commerce Blvd over Hinebaugh Creek in Sonoma County, California. It was built in 1970, so it is 55 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 500 vehicles a day, roughly 2% of them trucks, projected to reach 1,642 by 2045. The structure is 48 ft (14.6 m) long and 46 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesCommerce Blvd
CrossesHinebaugh Creek
Location0.1 MI N Rnpk Expressway
RouteCity Street 0
CountySonoma County
StateCalifornia
Coordinates38.35047, -122.70954
Functional classUrban Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadUnknown
Structure length48 ft (14.6 m)
Longest span12 ft (3.6 m)
Deck width46 ft (14.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (2015)
Projected traffic1,642 by 2045
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Commerce Blvd over Hinebaugh Creek built?

It was built in 1970, making it 55 years old in 2025.

What condition is Commerce Blvd over Hinebaugh Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in June 2023.

How much traffic does Commerce Blvd over Hinebaugh Creek carry?

About 500 vehicles per day (2015 count), of which roughly 2% are trucks.

How long is Commerce Blvd over Hinebaugh Creek?

The structure is 48 ft (14.6 m) long with a longest span of 12 ft (3.6 m) and a deck 46 ft wide.

Who owns Commerce Blvd over Hinebaugh Creek?

It is owned by the City or Municipal Highway Agency.